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Patent US5485311A successfully refreshed from Google Patents.
US5485311A
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Method of increasing retroreflective brightness in a retroreflective sheet material
Assignee: RNM HOLDINGS Ltd
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Filing: 1995-01-06
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Granted: 1996-01-16
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Expires: 2015-01-06
Abstract
Abstract A method of increasing retroreflective brightness in a retroreflective sheet material. The retroreflective sheet material has a multitude of prism-like reflective elements imbedded in a transparent polymer plastic top film and glued by a grid of adhesive to a backing sheet. The method includes the step of heating the retroreflective sheet material until bubbles form in the transparent polymer plastic top film containing the prism-like reflective elements. The bubbles are confined by the grid. The bubbles serve as miniature magnifying lenses which increase retroreflective brightness and increase the exposure area thereby providing a wider observation angle.
Inventors
- 👤 Richard McAllister
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-05 08:20
CPC Classifications
G; G02; G02B; G02B5/00; G02B5/12; G02B5/122; G02B5/124; Y; Y10; Y10S; Y10S359/00; Y10S359/90
Claims Analysis
Total Claims: 2
Claim 1
Independent Claim
87 words
A method of increasing retroreflective brightness in a retroreflective sheet material having a multitude of prism-like reflective elements contained within a transparent polymer plastic top film, the top film adhering in a grid pattern to a backing sheet, comprising the step of: heating the retroreflective sheet material until bubbles form in the transparent polymer plastic top film containing within it the prism-like reflective elements, the bubbles being confined by the grid, the bubbles serving as miniature magnifying lenses which increase retroreflective brightness and widen the observation angle.
Claim 2
Independent Claim
87 words
A method of increasing retroreflective brightness in a retroreflective sheet material having a multitude of prism-like reflective elements contained within a transparent polymer plastic top film, the top film adhering in a grid pattern to a backing sheet, comprising the step of: heating the retroreflective sheet material until bubbles form in the transparent polymer plastic top film containing within it the prism-like reflective elements, the bubbles being confined by the grid, the bubbles serving as miniature magnifying lenses which increase retroreflective brightness and widen the observation angle.
References Cited (Backward Citations)
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1999-01-15 | 1999-07-17 | 2000-01-16 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 2003-01-15 | 2003-07-17 | 2004-01-16 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 2007-01-15 | 2007-07-17 | 2008-01-16 | $7700.00 | Window Closed / Lapsed |